Final answer:
Before Macbeth first appears on stage, we learn of his bravery and martial prowess from a captain's report, of his impending rise to power through the Weird Sisters' prophecies, and of his respected standing, as reflected in King Duncan's decision to bestow upon him the title of Thane of Cawdor.
Step-by-step explanation:
Before Macbeth makes his first appearance in Shakespeare's play, we learn a great deal about his character from the conversations and scenes that precede his entrance. Primarily, Macbeth is introduced to us through the perspectives of other characters, including the Weird Sisters, a captain, King Duncan, and Ross. From the captain's report, we are told of Macbeth's bravery and martial prowess on the battlefield where he is described as deserving the name 'brave Macbeth.' He is celebrated for his role in quelling the rebellion and the invasion attempt, showing his loyalty to King Duncan.
Furthermore, the Weird Sisters greet him with cryptic prophecies, initially acknowledging him as the Thane of Glamis, then surprising him by calling him the Thane of Cawdor and predicting that he shall be king hereafter. This gives readers a glimpse into the supernatural elements of the play and Macbeth's character as someone whose ambition will be stirred by prophecy. Lady Macbeth also speaks of him in high regard and appears to be knowledgeable about his nature and aspirations, as seen when she reads a letter from him detailing the witches' prophecy.
Echoing these sentiments is King Duncan's announcement that the traitorous Thane of Cawdor is to be executed and that Macbeth will receive this title as a reward for his heroism. These early insights into Macbeth's character pave the way for his introduction and set the tone for the themes of ambition, fate, supernatural influence, and moral complexity that will dominate the play.